ISHS Acta Horticulturae 687: International Conference Postharvest Unlimited Downunder 2004
OPTIMISATION OF CALCIUM LACTATE WASHING TREATMENT ON SALAD-CUT LETTUCE: QUALITY ASPECTS |
| Authors: | A.B. Martin-Diana, D. Rico, C. Barry-Ryan, J.M. Frias, J. Mulcahy, G.T.M. Henehan |
| Keywords: | Salad-cut lettuce, enzymatic browning, calcium lactate, temperature, quality, safety |
| Abstract:
Markers of quality retention: colour, texture, browning, texture related enzymes and sensory properties, were analysed during storage. The use of high temperatures (50ºC) showed a positive effect on enzymes related to quality maintenance. It reduced the activity of the browning-related enzymes polyphenol oxidase and peroxidase but it increased the activity of pectin methyl esterase, an enzyme involved in the maintenance of texture. High calcium lactate concentrations (3 %) produced a reduction in the respiration rate of the salad-cut lettuce during storage, but also a loss of luminosity and greenness (a*). The use of high temperatures and intermediate calcium lactate concentrations (1.5 %) proved to be the best washing treatment to maintain the quality of salad-cut lettuce over 10 days storage. These conditions (50 ºC and 1.5 % calcium lactate) gave higher freshness scores and lower browning scores than conventional chlorine treatment when evaluated by a sensory panel. | |
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